package rsj.util;

import java.lang.reflect.Field;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
 
public class EntityUtils {
	/**
	 * 实体类转Map
	 * @param object
	 * @return
	 */
	public static Map<String, Object> entityToMap(Object object) {
		Map<String, Object> map = new HashMap();
	    for (Field field : object.getClass().getDeclaredFields()){
	        try {
	        	boolean flag = field.isAccessible();
	            field.setAccessible(true);
	            Object o = field.get(object);
	            map.put(field.getName(), o);
	            field.setAccessible(flag);
	        } catch (Exception e) {
	            e.printStackTrace();
	        }
	    }
	    return map;
	}

	public static <T> List<T> listMapToListObject(List<Map<String,Object>> maps, Class<?> clazz){
		List<T> results = new ArrayList<>(maps.size());
		maps.forEach(map -> {
			results.add(mapToEntity(map, clazz));
		});
		return results;
	}
	
	/**
	 * Map转实体类
	 * @param map 需要初始化的数据，key字段必须与实体类的成员名字一样，否则赋值为空
	 * @param entity  需要转化成的实体类
	 * @return
	 */
	public static <T> T mapToEntity(Map<String, Object> map, Class<?> entity) {
		T t = null;
		try {
			t = (T) entity.newInstance();
			for(Field field : entity.getDeclaredFields()) {
				if (map.containsKey(field.getName())) {
					boolean flag = field.isAccessible();
		            field.setAccessible(true);
		            Object object = map.get(field.getName());
		            if (object!= null && field.getType().isAssignableFrom(object.getClass())) {
		            	 field.set(t, object);
					}
		            field.setAccessible(flag);
				}
			}
			return t;
		} catch (Exception e){
			throw new RuntimeException(e);
		}
	}
}